Instrument for measuring the velocity of flow of fluids.



ILOONTZEN. INSTRUMENT FOR MEASURING THE VELOCITY OF FLOW 0F FLUIDS. APPLICATION FILED JUNE 27, 1913. 1,128,949. Patsnted Feb.16, 1915.

lqztizeacsed 4 2 1/9. Colzlz ea nnmnron CON'IZEN, or DUssELnonF, GERMANY.

INSTRUMENT FOR MEASURING VELOCITY 0F FLOW 0F FLUIDS.

Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed June 2' 1913. Serial No. 776,162.

To all whom "it may concern:

Be it lmown that .1, Hammer: CONTZEN, citizen of the German Empire,.residing at Dusseldorf, Germany, have invented certain new and useful Improvements in In strurnents for Measuring the Velocity of. Flow of Fluids, of which the following is a specification.

This invention relates to improvements in instruments used to record the velocity of flow of fluidssuch as air, gas, steam or the like, and designed to work on the principle of the measurement of dynamic forces-such as the Pitot tubes.

The invention relates more particularly to the recordingmechanism whereby data isv obtained for calculating not only the velocity, but also the quantity of fluid which has passed through the duct in any given time even although the velocity of flow has been varying.

The invention will be more readily understood from the following description of one convenient form illustrated by way of example in the accompanying drawings in whichi Figure 1 is a somewhat diagrammatic representation of the instrument in front view. Fig. 2 is a side view of part of the mechanism. Fig. 3 is a side view of a modifiedform. .Fig. 4, is a view of a modified form of cam. Fig. 5 is a detail View of a modified form of recording mechanism.

In carrying the invention into efiect according to one form as shown in Fig.1, a member a, is provided which is acted upon by the different pressures due to the different dynamic forces such as are obtained by the two connections from the well known Pitot tubes. The member a, is in the form shown, shaped as a bell inclosed within a casing 6, which is sealed at its top end and also by an annular seal 7. A pipe 8 leads from one of the Pitot connections into the interior of the hell 0:, while the other Pitot tube is connected up to a pipe 9 which opens into the exterior of the bell a, and the upper part of the closed casing 6. The bell a, is thus subjected in the known manner to the pressure difierence of the Pitot tubes'and rises and falls with variations which are recorded by a pencil 6, supported on an upright arm 6f, passing within a sealed tube 6'.

According to this invention, the pencil b, is connected by a cord 0, to a pulley d, which is mounted loosely on a spindle 7a. The

- tion of-the arrow 16 1n Fig. 1.

spindle is, is suitably supported in a bracket 10 fixed to the exterior of the casing 6. A box or outside casing 11 may be suitably fixed to the casing 6. This box is shown in section in Fig. 1, but is omitted in Fig. 2, and it may be provided with a glass front or suitable openings to enable the inspection and reading of the recording mechanism.

-The pulley d, has also a small pulley rim 1?.

to which there is fixed a cord 13, carrying a weight e. The cord 0, tends to pull the .pulley d, round when the bell a, rises and the cord 13 and weight e, pull the pulley d, 111 the opposite direction so that the pulley follows the movements of the bell.

i The pulley d, is provided with a project mg pin 72., which during rotation of the pulley engages a pin 2', fixed on a cam plate f, loosely mounted on the spindle k. The cam plate f, has fixed to it a pulley 14k, to which a cord 15 carrying :a weight m, is fixed. The bell a, in rising tends to move the pulley d, and earn plate 7, in the direc- The cam plate 7, is of a fiat spiral.outline or substantially so. In the rotation of the cam plate f, under the action of thebell a, in rising therefor, a lower partof the sam is brought opposite a recording member in the form of a vertical finger piece 0, guided in brackets q.

The recording finger piece 0 is connected by a cord 0, to a pulley d, fixed to rotate with the shaft 10 mounted in the upper part of the casing 11. The pulley d,, is provided with a pin k projecting laterally therefrom to en age with a radial arm 2),, on the shaft k Zn oil damping device contained in a tank .2 and operated. from a toothed wheel 2,, on the shaft k damps the rotation of the shaft 70,, when it is rotated by mechanism described later. To the left of the pulley (5,, in Fig. 1, there is mounted a counting box g, operated from a ratchet wheel '0, having a driving pawl u, and a detent pawl u, engagin therewith. The driving pawl u, is carried y an arm 16 on thepulley (L. The pawl u, only drives the ratchet wheel '0, when the finger 0, falls and the amount of the fall of finger o, is limited by the posi tion of the cam f, which is in turn depend ent upon the position of the bell a. The counter p, thus gives the sum of the ordi- 'nates o a curve and these ordinates may be assumed to be erected on a base spaced into equal time intervals. The

suitably ber of intervals is recorded by a counter 9 which is operatedtby a projecting pin 2' engaging an arm h of the counter 9 The,

pulleyal has fixedto ita cord 0 carrying a weight m 'tending to move the shaft 761 in one direction. The shaft 75,, -is moved in the other direction by a water or liquid operatedmechanism. lAtank w, isfprovided with a siphon 17. "When the tank w, is filled to a' hei ht'above the'bend bf the siphon, liquid iiows therethroughdnto a tank sycarried by cords 0 fixed-to'pulleys 03 501! the shaft k When suflicie'nt weight of liquid has'passed'dnto the tanks, this tank falls and rotates the shaft k against the counterweight-m When the tank 2, falls to thebrackets 2' it stops and liquid may continue to flow into the" tank 2, until the "siphon 18inthis"ta'nk' is'filled. "The liquid then siphons out-of the tank 2, into 'the'waste tank 2,, and the" bucket or tank a, rises owing to the weight m overcoming the Weight of theemptytank. "The mechanism described raises and lowers "the fingers o, periodically.

It will -be readily understood how' it is possible" with'the above'data to be'read from theconnters g and g ,'it is possible to calculate the mean velocity of fiow of'the gases to' "be measured and "therefore the quantity passing the duct. In some cases the two counters may be coupled to a logarithmic counter from which the average velocity or the-quantity'of gas passing m'aybe directly read. The pencil b, will 'of course register the'fiuctuations in the ordinary manner.

' Insome cases it may be advisable toallow the bell a, free motion either up or down after the cam f, isxarr'ested by the finger o. The arrangement of pins hand a, in Fig! 1, only leaves freedom of movement in onedirection. To give freedom of movement in both directions, an intermediate pulley p (Fig. 3) may be interposed having pins s and 1', projecting laterally from opposite sides to engage with the lateral projections h and 2', on the pulley d and cam f, resepectively. The pulley p, is also provided with a weight n, so that it follows the pulley d, but when pushed back by the pulley, carries the pin 5, away from projection 2', and therefore the cam 7, only follows the a pin 2', in sucha case if it is not held by the finger 0. In place of'th'eweights m and'e, for retaining the projections h and i, in contact I may employ other means such as a spiral spring m -Fig. 4, fixed at one end to the spindle is, and at the other to the cam *VVhen' the finger o, is arrested, the cord 0 slackens and may pass'from the groove of eratethe finger 0, from the crank h having for controlling zthe operation' bf said liquid pulley d, to avoid this difficulty I may opa pin movable i-n aislot in a link n pivoted to the finger at 0 While the-pin 0 is connected as before by the cord 0 to the pul- 1.-An'-instrument for recording the flow ofgas comprising a bell subjected to and movable under diiierences of pressure caused by the flow of gas to be measured, a

cam.movableindependently of but following the movements ofsaid bell, a finger periodically movable'to contact with said cam to mutually: arrest'said'. finger-and cam, a

motor operating said finger and movable in- 'ments of said pressuremember, a recording member, a liquid" motor for periodically moving said recording member'into engagement with said cam, means for recordingthe ,amount of' movement of said recording member,rmeans for counting the number bf records n1ade,'and an oil-damping device a motor.

3. In combination; a closedcohtainer, a bell therein, a pressure supply to theiinterior of said b ll, pressure -supply to the exterior bf sa1dbell,I-a" rotatable "piilley, means for retaining said pl-illey'in one position, a connecti'on'from "said b'll to" said -pulley to move said pulleyagainst the ac tion of said retaining means, a .cam having a spiral contour, said cam being freely. 1 mounted coaxially with said pulley, a member inte'rmediat'between said cam and said pulley to move the camwith said pulley'but leave said pulley free to rotate independently ofthe cam, a recording finger movable on to the surfaceof said cam to arrest'thesame, a rotatable element for movin said recording finger, ratchet mechanism or recording the amount of the movement of said finger, a counter cooperating with said rotatable element for moving said recording finger and time mechanism for periodically movingsaid recording finger 'on to said cam. In. testimony wherebf l have signed my name to this specificationin thepresence of "two subscribing witnesses.

HEINRICH CONTZEN.

Witnesses:

J ACOB' PLANTS, LEWIS Vasnonv. 

